中科院南京地质古生物研究所周四(28日)指,中国科研人员早前联同英国、瑞典、瑞士学者,在贵州发现一批有6.1亿年历史的胚胎化石,成为至今人类发现最古老的动物胚胎化石。
有关发现更被刊于国际知名期刊《当代生物学》上。
是次发现胚胎化石名为“笼脊球”,化石整体呈球形,每颗直径不足1毫米,且完整保存其多细胞结构。
研究人员发现指,这些笼脊球均在充满营养物质的厚壁囊包中发育,发育过程既类似动物的单细胞近亲,又更为复杂,显示出有规律的细胞迁移、重组等动物胚胎特有的发育机制。
研究所指,是次发现记录了动物由单细胞向多细胞演化的关键一步,为真正有细胞和组织分化的动物出现奠定了生物学基础。
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